From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_RED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BBE5BC4332B for ; Mon, 28 Dec 2020 13:58:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8C741207A1 for ; Mon, 28 Dec 2020 13:58:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391604AbgL1N6M (ORCPT ); Mon, 28 Dec 2020 08:58:12 -0500 Received: from mail.kernel.org ([198.145.29.99]:59930 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391579AbgL1N6J (ORCPT ); Mon, 28 Dec 2020 08:58:09 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7410C208B3; Mon, 28 Dec 2020 13:57:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609163849; bh=asRQwO+15DufR5dDPW0ZkNYMUe2EfFUbF3M/AzTsmD4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=L5Kk8A1xCeO1/DFqKU+7b0QWbNLYyaOYvYGCc3n7euY7oNnJBm+waSiDdO+h1v/it uhYltuokw5yoLTYqwjZQFYeb0WSv/J4lqmA5yfsAa/XYASyyS9hxZn4tBwX3GajXJf 4ze/8bvXBSL653GrrNPJANu8/TudCNFgDXSYyirM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Lars-Peter Clausen , Jonathan Cameron , Alexandru Ardelean , Stable@vger.kernel.org Subject: [PATCH 5.4 429/453] iio:magnetometer:mag3110: Fix alignment and data leak issues. Date: Mon, 28 Dec 2020 13:51:05 +0100 Message-Id: <20201228124957.867387466@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228124937.240114599@linuxfoundation.org> References: <20201228124937.240114599@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jonathan Cameron commit 89deb1334252ea4a8491d47654811e28b0790364 upstream. One of a class of bugs pointed out by Lars in a recent review. iio_push_to_buffers_with_timestamp() assumes the buffer used is aligned to the size of the timestamp (8 bytes). This is not guaranteed in this driver which uses an array of smaller elements on the stack. As Lars also noted this anti pattern can involve a leak of data to userspace and that indeed can happen here. We close both issues by moving to a suitable structure in the iio_priv() data. This data is allocated with kzalloc() so no data can leak apart from previous readings. The explicit alignment of ts is not necessary in this case but does make the code slightly less fragile so I have included it. Fixes: 39631b5f9584 ("iio: Add Freescale mag3110 magnetometer driver") Reported-by: Lars-Peter Clausen Signed-off-by: Jonathan Cameron Reviewed-by: Alexandru Ardelean Cc: Link: https://lore.kernel.org/r/20200920112742.170751-4-jic23@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/iio/magnetometer/mag3110.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) --- a/drivers/iio/magnetometer/mag3110.c +++ b/drivers/iio/magnetometer/mag3110.c @@ -56,6 +56,12 @@ struct mag3110_data { int sleep_val; struct regulator *vdd_reg; struct regulator *vddio_reg; + /* Ensure natural alignment of timestamp */ + struct { + __be16 channels[3]; + u8 temperature; + s64 ts __aligned(8); + } scan; }; static int mag3110_request(struct mag3110_data *data) @@ -387,10 +393,9 @@ static irqreturn_t mag3110_trigger_handl struct iio_poll_func *pf = p; struct iio_dev *indio_dev = pf->indio_dev; struct mag3110_data *data = iio_priv(indio_dev); - u8 buffer[16]; /* 3 16-bit channels + 1 byte temp + padding + ts */ int ret; - ret = mag3110_read(data, (__be16 *) buffer); + ret = mag3110_read(data, data->scan.channels); if (ret < 0) goto done; @@ -399,10 +404,10 @@ static irqreturn_t mag3110_trigger_handl MAG3110_DIE_TEMP); if (ret < 0) goto done; - buffer[6] = ret; + data->scan.temperature = ret; } - iio_push_to_buffers_with_timestamp(indio_dev, buffer, + iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, iio_get_time_ns(indio_dev)); done: